ARDSLEY ADVISORY PARTNERS LP — 13F Holdings & Portfolio
CIK 900529 · latest 13F-HR filed 2026-07-13
ARDSLEY ADVISORY PARTNERS LP manages $960.2M in 13F-reported U.S. long-equity assets across 145 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are SNDK (5.90%), AMD (5.63%), SEZL (3.84%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 58 new positions, exited 45, added to 42, and trimmed 24.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
NORWALK, CT 06853
$960.2M
Long-equity book
145
Distinct positions
2026-06-30
Filed 2026-07-13
+58 / −45 / ↑42 / ↓24
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- ADVANCED MICRO DEVICES INC$52.4M +3219.6%
- SANDISK CORP$30.0M +112.2%
- SEZZLE INC$17.9M +94.3%
- ARM HOLDINGS PLC$13.9M +510.5%
- EBAY INC.$9.5M +74.1%
Top Trims
- BROADCOM INC-$19.8M -71.4%
- UNITED THERAPEUTICS CORP DEL-$13.4M -45.2%
- SEMTECH CORP-$12.6M -63.4%
- MODINE MFG CO-$7.7M -39.1%
- AMAZON COM INC-$5.6M -25.5%
New Positions
- EVERPURE INC$18.3M
- PALO ALTO NETWORKS INC$14.6M
- PRIMORIS SVCS CORP$13.4M
- APPLE INC$13.0M
- ONTO INNOVATION INC$11.9M
Exited Positions
- ARISTA NETWORKS INC$21.3M
- META PLATFORMS INC$16.0M
- NVIDIA CORPORATION$15.3M
- BOSTON SCIENTIFIC CORP$9.4M
- APPLIED MATLS INC$8.5M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | SANDISK CORP | SNDK | 80004C200 | $56.7M | 5.90% | 25,000 | SH |
| 2 | ADVANCED MICRO DEVICES INC | AMD | 007903107 | $54.0M | 5.63% | 93,000 | SH |
| 3 | SEZZLE INC | SEZL | 78435P105 | $36.9M | 3.84% | 215,000 | SH |
| 4 | TERAWULF INC | WULF | 88080T104 | $23.7M | 2.47% | 966,000 | SH |
| 5 | BRIGHTSPRING HEALTH SVCS INC | BTSG | 10950A106 | $22.7M | 2.36% | 325,000 | SH |
| 6 | EBAY INC. | EBAY | 278642103 | $22.3M | 2.32% | 201,000 | SH |
| 7 | SUNRUN INC | RUN | 86771W105 | $21.4M | 2.23% | 1,600,000 | SH |
| 8 | VIAVI SOLUTIONS INC | VIAV | 925550105 | $18.6M | 1.94% | 390,000 | SH |
| 9 | EVERPURE INC | P | 74624M102 | $18.3M | 1.91% | 233,000 | SH |
| 10 | ARM HOLDINGS PLC | ARM | 042068205 | $16.6M | 1.73% | 47,000 | SH |
| 11 | SHOALS TECHNOLOGIES GROUP IN | SHLS | 82489W107 | $16.5M | 1.72% | 1,665,000 | SH |
| 12 | AMAZON COM INC | AMZN | 023135106 | $16.4M | 1.71% | 69,000 | SH |
| 13 | UNITED THERAPEUTICS CORP DEL | UTHR | 91307C102 | $16.3M | 1.69% | 30,000 | SH |
| 14 | TEVA PHARMACEUTICAL INDS LTD | TEVA | 881624209 | $15.8M | 1.64% | 465,000 | SH |
| 15 | ALPHABET INC | GOOG | 02079K107 | $15.3M | 1.60% | 43,500 | SH |
| 16 | PALO ALTO NETWORKS INC | PANW | 697435105 | $14.6M | 1.52% | 43,000 | SH |
| 17 | TWILIO INC | TWLO | 90138F102 | $14.2M | 1.48% | 69,000 | SH |
| 18 | PRIMORIS SVCS CORP | PRIM | 74164F103 | $13.4M | 1.39% | 135,000 | SH |
| 19 | APPLE INC | AAPL | 037833100 | $13.0M | 1.35% | 45,000 | SH |
| 20 | ZOOM COMMUNICATIONS INC | ZM | 98980L101 | $12.5M | 1.30% | 145,000 | SH |
| 21 | MODINE MFG CO | MOD | 607828100 | $12.0M | 1.25% | 45,000 | SH |
| 22 | ONTO INNOVATION INC | ONTO | 683344105 | $11.9M | 1.24% | 31,500 | SH |
| 23 | TD SYNNEX CORPORATION | SNX | 87162W100 | $11.6M | 1.21% | 43,500 | SH |
| 24 | BROOKDALE SR LIVING INC Call | BKD | 112463104 | $11.1M | 1.16% | 690,000 | SH |
| 25 | ENPHASE ENERGY INC | ENPH | 29355A107 | $10.8M | 1.12% | 220,000 | SH |
| 26 | ALLEGIANT TRAVEL CO | ALGT | 01748X102 | $10.6M | 1.10% | 90,000 | SH |
| 27 | OKTA INC | OKTA | 679295105 | $10.4M | 1.09% | 76,500 | SH |
| 28 | EQUINIX INC | EQIX | 29444U700 | $10.4M | 1.09% | 10,000 | SH |
| 29 | HUT 8 CORP | HUT | 44812J104 | $10.4M | 1.08% | 90,000 | SH |
| 30 | ALPS ETF TR | AMLP | 00162Q452 | $10.4M | 1.08% | 200,000 | SH |
| 31 | OSCAR HEALTH INC | OSCR | 687793109 | $10.0M | 1.04% | 350,000 | SH |
| 32 | BLOOM ENERGY CORP | BE | 093712107 | $9.4M | 0.98% | 31,000 | SH |
| 33 | CIPHER DIGITAL INC | CIFR | 17253J106 | $9.2M | 0.96% | 375,000 | SH |
| 34 | NU HLDGS LTD | NU | G6683N103 | $9.0M | 0.94% | 675,000 | SH |
| 35 | CEREBRAS SYSTEMS INC | CBRS | 15675D103 | $8.7M | 0.90% | 39,000 | SH |
| 36 | LUMENTUM HLDGS INC | LITE | 55024U109 | $8.5M | 0.89% | 10,000 | SH |
| 37 | REMITLY GLOBAL INC | RELY | 75960P104 | $8.4M | 0.88% | 375,000 | SH |
| 38 | DEVON ENERGY CORP NEW | DVN | 25179M103 | $8.3M | 0.86% | 200,000 | SH |
| 39 | BROADCOM INC | AVGO | 11135F101 | $7.9M | 0.83% | 21,000 | SH |
| 40 | ALASKA AIR GROUP INC | ALK | 011659109 | $7.8M | 0.82% | 150,000 | SH |
| 41 | CORNING INC | GLW | 219350105 | $7.7M | 0.80% | 30,000 | SH |
| 42 | FLUOR CORP | FLR | 343412102 | $7.5M | 0.78% | 142,500 | SH |
| 43 | VERTEX PHARMACEUTICALS INC | VRTX | 92532F100 | $7.5M | 0.78% | 15,000 | SH |
| 44 | VERACYTE INC | VCYT | 92337F107 | $7.3M | 0.76% | 125,000 | SH |
| 45 | SEMTECH CORP | SMTC | 816850101 | $7.3M | 0.76% | 45,000 | SH |
| 46 | JAZZ PHARMACEUTICALS PLC | JAZZ | G50871105 | $7.2M | 0.75% | 30,000 | SH |
| 47 | FERROGLOBE PLC | GSM | G33856108 | $6.9M | 0.72% | 2,185,000 | SH |
| 48 | AKAMAI TECHNOLOGIES INC | AKAM | 00971T101 | $6.6M | 0.69% | 56,000 | SH |
| 49 | ORACLE CORP Call | ORCL | 68389X105 | $6.6M | 0.69% | 45,000 | SH |
| 50 | VERIZON COMMUNICATIONS INC | VZ | 92343V104 | $6.6M | 0.68% | 155,000 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-07-13 | $960.2M | 145 | 0001172661-26-002590 |
| 2026-03-31 | 2026-05-15 | $784.4M | 151 | 0001172661-26-002039 |
| 2025-12-31 | 2026-02-17 | $911.1M | 142 | 0001172661-26-000864 |
| 2025-09-30 | 2025-11-14 | $808.7M | 130 | 0001172661-25-004897 |